Question : A person covers the first 15 km in 60 minutes and the next 24 km in 30 minutes. What is his average speed for the whole journey?
Option 1: 33 km/hr
Option 2: 26 km/hr
Option 3: 29 km/hr
Option 4: 23 km/hr
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Correct Answer: 26 km/hr
Solution : Total distance = 15 + 24 = 39 km Total time = 60 + 30 = 90 min = 1.5 hr Average speed $=\frac{\text{total distance}}{\text{total time}}=\frac{39}{1.5}= 26$ km/hr Hence, the correct answer is 26 km/hr.
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